Specifically, during the World Enlarger phase where you possess a Spark Bot.

My settings were as follows:

[ ] Use Blizzard Vehicle UI (unchecked)

[ ] Hide when Vehicle UI (unchecked, Bar 1)

[ ] State Configuration (unchecked, Bar 1)

I have since changed my settings (screenshots attached):

[ x ] Use Blizzard Vehicle UI (unchecked)

[ ] Hide when Vehicle UI (unchecked, Bar 1)

[ x ] State Configuration (enabled, Bar 1)

[ x ] Possess Bar (enabled, Bar 1)

I am a bit reluctant to return to the encounter whilst being dubious about my settings. Can anyone tell me if the above settings should do it? I will report back my own findings otherwise. I'm guessing the cause of the problem is an unchecked State Configuration for Bar 1, causing my standard abilities to display instead of the encounter's 'vehicle' controls.